Fix phone number returned by 'Das Telefonbuch' for business numbers.

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Change-Id: Ib69dac5c79b01947d6085bf27b61c0f7a4d73a4c
Make reverse lookup implement the phone number lookup interface (1/2)

Change-Id: I35195d6c5a89cf22ac0f31d48e2ef89102a453c1